We would like to inform you that the Microsoft Sentinel service issue affecting multiple Azure regions has now been resolved.
Affected Service: Microsoft Sentinel Regions: Multiple Azure regions worldwide
Impact: A subset of customers may have experienced delays in incident ingestion, processing, and incident status updates within Microsoft Sentinel.
Start Time: 28 October 2026, 09:52 UTC
Resolution Time: 28 October 2026, 18:10 UTC
Current Status: Microsoft identified a significant increase in processing demand that exceeded available backend resources, resulting in processing backlogs and increased latency.
Microsoft implemented mitigation measures to reduce processing pressure and prioritize the recovery of accumulated backlogs. Service performance returned to expected levels at 18:10 UTC on 28 October 2026, and customer impact was confirmed as mitigated.
Next Steps: Microsoft will conduct an internal retrospective and publish a Post-Incident Review (PIR) to impacted customers, generally within 14 days.
Thank you for your patience and understanding throughout this matter.
North America: 1-866-929-3528 EMEA: +41 58 317 77 77
Kind regards, The Cyber Fusion Center
Posted Oct 30, 2026 - 09:06 UTC
Identified
Dear Customer,
We would like to inform you about an ongoing issue affecting the Microsoft Sentinel service across multiple regions.
Affected Service: Microsoft Sentinel Regions: Multiple Azure regions worldwide
Impact: A subset of customers may experience delays in incident ingestion, processing, and incident status updates within Microsoft Sentinel.
Start Time: 28 October 2026, 09:52 UTC
Current Status: Microsoft has identified increased processing demand exceeding available resources in part of its infrastructure, resulting in processing backlogs and increased latency. Service performance initially improved following mitigation measures; however, a slight increase in backlog and processing delays has since been observed.
Microsoft is implementing additional mitigation measures to increase processing throughput and reduce the volume of data requiring processing, while continuing to monitor service health.
Next Update: Microsoft will provide the next update within 6 hours, or sooner if significant developments occur.
Thank you for your patience and understanding throughout this matter.
North America: 1-866-929-3528 EMEA: +41 58 317 77 77